WCF客户端代理对象创建问题

Question

我正在使用WCF服务库，我返回列表。然后在MVC-4应用程序中创建服务引用。但是无法创建代理客户端对象。我也配置了服务引用并将Collection类型设置为System.Collections.Generic.List但仍然遇到问题。

Mu Code In Service Library是：

[ServiceContract]
    public interface IStudent
    {

       // [WebGet(ResponseFormat = WebMessageFormat.Json)]
        [OperationContract]
        [WebInvoke(BodyStyle = WebMessageBodyStyle.Bare, ResponseFormat = WebMessageFormat.Json)]
        List<Studentdata> GetData();


    }

    [DataContract()]
    public class Studentdata
    {
        [DataMember()]
        public string StudentId { get; set; }
        [DataMember()]
        public string FirstName { get; set; }
        [DataMember()]
        public string LastName { get; set; }
        [DataMember()]
        public Nullable<int> Age { get; set; }
        [DataMember()]
        public string Gender { get; set; }
        [DataMember()]
        public string Batch { get; set; }
        [DataMember()]
        public string Address { get; set; }
        [DataMember()]
        public string Class { get; set; }
        [DataMember()]
        public string School { get; set; }
        [DataMember()]
        public string Domicile { get; set; }

    }

    StudentDataAccess obj = new StudentDataAccess();
    public List<Studentdata> GetData()
            {
                var query = obj.getalldata().ToList();
                List<Studentdata> obj1 = query.ToList().ConvertAll(new Converter<BtDataLayer.Student, Studentdata>(Converter.ConvertEntStudentToWcfStudent));

                return obj1;

            }

StudentDataAccess obj = new StudentDataAccess（）; 是实体项目类对象

请帮帮我。提前谢谢。